Generalise the palette so Enter advances any pref to its next value and
wraps; a boolean toggle is the two-option case. Both string prefs share a
next_option(current, &OPTIONS) helper (off-list values snap to the head).
- theme (light/dark): rendered as a single whole-frame Frame::invert at the
end of draw(), so text, selection, caret, panel and palette flip together.
- auto_sync: cycles 2m/5m/10m/15m/30m. Set-ahead only — still read by
nothing until the v0.7 periodic push.
toggle_pref -> cycle_pref; palette hint "Enter toggle" -> "Enter change".
Land the v0.1 editor integration: the git_sync module (libgit2 on the SD
/sd/repo, dedicated 96KB git thread, lazy Wi-Fi, :sync push with
synced/up-to-date/failed snackbars), the boot splash (Spike 9) plus its bin
and justfile recipes, and a power-on→cursor boot-timing log. Also re-syncs
the roadmap/spikes/v0.1-product status and adds the SD hardware reference
photo.
Move the editor core out of the firmware crate (pinned to the xtensa
target, so it can't run `cargo test`) into a standalone `editor` crate,
with the panel framebuffer + geometry split into a `display` crate. Both
depend only on embedded-graphics + keymap, so the editor is now
host-buildable and unit-tested (8 characterization tests). Firmware links
them and re-exports the geometry from epd.rs; behaviour is unchanged.
The xtensa firmware build was not verified in this environment.
